: These diamond drill are made of high 45 steel which is high and durable. With a -plated coated body to resist corrosion, which has a long service life. chip holes to when the punching , punching .Smoothly Cutting: A thicken diamond dust coating on the tops offers superior cutting strength for creates a high precision, cut with no broken edges. Reduced drill speeds, low drill pressure, and increased use of water lubrication will extend drill bit life considerably.Multiple Applications: The diamond drill bit can remove a complete 130mm diameter hole on glass, tiles, granite, ceramic. In addition to cutting holes for glass, the comes in for tile bottles, blocks jars, fiberglass, porcelain tile, ceramic, , marble, light stone. Not for use on Concrete or for depths beyond about 1/2inch.Specification:Finish: -platedColour:SilverMaterial:Diamond+45 steelSize:130mmPackage Contents:1* diamond drill bitHow to Use:1. Put glass drill into the driller.2. Because this cannot locate the , so please cutting with it slowly with 45 degrees.3. Please cut a small first to locate the , then you can cut the material vertically.4. The speed needs to be controlled, not too fast and water is required during cutting.Attention1. When you using the diamond drill , please use lubrication (water). Otherwise, the diamond core drill will burn.2. Please do not cut metal material with this tool.3. Not for use on Concrete or for depths beyond about 1/2inch.4. Please keep the speed within 800-1000 per , low drill pressure, and increased use of water lubrication will extend drill bit life.Only the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.